WO_3/(TiO_2-SiO_2)催化剂的表面分散状态及催化性能的研究  

Studies on Dispersion State and Catalytic Activities of WO_(3)/(TiO_(2)-SiO_(2))

作　　者：梁均方[1] 

机构地区：[1]嘉应学院化学系,广东梅州514015

出　　处：《分子催化》2006年第5期424-428,共5页Journal of Molecular Catalysis(China)

摘　　要：用气相流动吸附法制备复合载体,用浸渍法制备WO3/(TiO2-S iO2)催化剂.应用LRS和TPR技术研究WO3在复合载体TIO2-S iO2表面的分散状态,发现TiO2在S iO2表面的分散可增强WO3与载体之间的相互作用,提高WO3在载体表面的分散阈值.另外TPR实验证明,TiO2的存在不仅大大改善WO3的分散状态,而且使WO3在TiO2-S iO2的还原温度升高,WO3与载体之间的作用增强.负载于经TiO2调变的S iO2上的催化剂其HDS、HYD、BHD活性高于负载于单纯S iO2上的催化剂的活性.the TiO2-SiO2 comples supporter were prepared by using gas phase adsorption method and WO3/（ TiO2- SiO2 ） catalyst was prepared by using impregnation method. Such techniques as LRS and TPR were used to study the surface dispersion state of WO3 on the surface of TiO2-SiO2complex support. The results showed that the dispersion of TiO2on SiO2 surface could enhance interaction between WO3 and support, and raised the dispersion threshold of WO3 on support surface. The TPR experimental results showed that the dispersion state of WO3 was improved effectively, the reduction temperature of WO3 on the surface of TiO2-SiO2 catalyst was enhanced and the reduchion amount was increased. The HDS, HYD, BHD activities of catalyst which supprted on SiO2 modified by TiO2 were higher than that of catalyst which single supported on SiO2.

关 键 词：气相流动吸附法 LRS TPR 分散状态 分散阈值 

分 类 号：O643.32[理学—物理化学]